Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f25e89155cce5cf…

MALICIOUS

PDF

86.0 KB Created: 2021-08-01 18:42:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2ccd37bf436b3b525afab6fdb1fc1b2d SHA-1: f7637ae9cd5108b9b4f8bc6f67f5ff3f5c250d13 SHA-256: 3f25e89155cce5cfd53473f4b7c7ecb491734841e0e0a2ac308b0a40bb4ddb63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories. The heuristics indicate it functions as a link farm, likely intended to redirect users to phishing sites or download further malicious payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=re+verbs+french+present+tense PDF link annotation
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160757fdb6d8f4---befujow.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/dekotaxajifa.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/romefukovapirijirig.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/59691643399.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/88161205225.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/25317ba585ee184bf5209a1ce7c6d3b7/vetusezizexala.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/9451ff988e794273482c1a7676fbd78d/72443196502.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073534bdcc0f---vixurex.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62f3492fd---59739785865.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5e56c1b94fda7a5996db586e91e9092b/dumaguxudatajokenu.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd0a528572---sopenogogi.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ba0d0df97ca3867618061dbc10d78c5a/46117302938.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/69aaecac00e1d225b296643f8bf05242/1866637796.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/fanefiwagebexepimivar.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c9076203af2---dakenajefinadupam.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910afaa7b9c---66314285274.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087988612df4---resawira.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/viful.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29124520df---15873582812.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/gusolasisixupi.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/17392651666.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/344ebe0ab91fe3158e2def6a6955b920/gumipadibebesivemuwoludap.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/95131834189.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091d984b682d---duvubosuwitetexoputitogig.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abaf0775985---musemijudigevo.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xebatemudalawegenawuf.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 10408 bytes
SHA-256: 69b1c6de40f808dd0ec4996b8806813f1fd5d249e5686ef7899b622b8e0dca65
font_01_sfnt_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 17872 bytes
SHA-256: 529a1114d6584d31635c3576593d550cf1231413bef70a5c893ff1a9e288b84d
font_02_sfnt_off00013093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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